High-speed 300W air-cooled motor, can used to make DC spindle, Small noise, Strong strength. Motor modified the clamping device and adopt CNC lathe machining. Specification: Spindle motor: New DC motor Power: 300W Operating voltage 12-48VDC Rotation Speed :3000-12000r / min. Torque: 230mN.m Insulation resistance:> 2 megohm Dielectric strength: 400V Diameter: 52mm Motor Overall length: 175mm (includes gripping parts and motor) Axis collet Length: 48mm Diameter of ER11-A clamping holder:16mm The spindle runout: about 0.01-0.04. Weight: 0.8kg Can be used for engraving metal or nonmetal materials. PWM Speed controller: Support AC and DC input DC Input : DC 15-160V AC Input : 12-110V input. Support Current :10 A PWM input : level 3.5-12V VPP, Frequency :1K-10KHZ(Particularly suitable for MCH3 spindle speed control. Package: 1 x 300W motor 1 x PWM Speed controller 1 x Mount bracket 4 x Screws